fix(display): All display updates in work thread.

* Make sure all LVGL access is from main work thread.

app/include/zmk/display.h

@@ -6,5 +6,4 @@
 
 #pragma once
 
-int zmk_display_init();
+int zmk_display_init();
-void zmk_display_task_handler();

app/src/display/main.c

@@ -24,6 +24,17 @@ static lv_obj_t *screen;
 
 __attribute__((weak)) lv_obj_t *zmk_display_status_screen() { return NULL; }
 
+void display_tick_cb(struct k_work *work) {
+    lv_tick_inc(10);
+    lv_task_handler();
+}
+
+K_WORK_DEFINE(display_tick_work, display_tick_cb);
+
+void display_timer_cb() { k_work_submit(&display_tick_work); }
+
+K_TIMER_DEFINE(display_timer, display_timer_cb, NULL);
+
 int zmk_display_init() {
     LOG_DBG("");
 
@@ -45,12 +56,8 @@ int zmk_display_init() {
     lv_task_handler();
     display_blanking_off(display);
 
+    k_timer_start(&display_timer, K_MSEC(10), K_MSEC(10));
+
     LOG_DBG("");
     return 0;
-}
+}
-
-void zmk_display_task_handler() {
-    lv_tick_inc(10);
-    lv_task_handler();
-    k_sleep(K_MSEC(10));
-}

app/src/display/widgets/output_status.c

@@ -41,20 +41,16 @@ void set_status_symbol(lv_obj_t *label) {
 
     switch (selected_endpoint) {
     case ZMK_ENDPOINT_USB:
-        LOG_DBG("USB, BOY!");
         strcat(text, LV_SYMBOL_USB "   ");
         break;
     case ZMK_ENDPOINT_BLE:
         if (active_profie_bonded) {
             if (active_profile_connected) {
-                LOG_DBG("Bonded & connected!");
                 sprintf(text, LV_SYMBOL_WIFI "%i " LV_SYMBOL_OK, active_profile_index);
             } else {
-                LOG_DBG("Bonded but not connected!");
                 sprintf(text, LV_SYMBOL_WIFI "%i " LV_SYMBOL_CLOSE, active_profile_index);
             }
         } else {
-            LOG_DBG("NOT Bonded!");
             sprintf(text, LV_SYMBOL_WIFI "%i " LV_SYMBOL_SETTINGS, active_profile_index);
         }
         break;

app/src/main.c

@@ -28,9 +28,5 @@ void main(void) {
 
 #ifdef CONFIG_ZMK_DISPLAY
     zmk_display_init();
-
-    while (1) {
-        zmk_display_task_handler();
-    }
 #endif /* CONFIG_ZMK_DISPLAY */
 }